Twin-Screw Extruders

Twin-Screw Extruders

B&P Littleford’s twin-screw extruders are the industry’s best in class for compounding. B&P Littleford’s line of twin-screw extruders are expertly engineered, skillfully constructed, and rigidly tested to handle the most challenging and demanding industrial applications that require kneading, dispersive mixing, distributive mixing, and reactive extrusion.

B&P Littleford’s twin-screw machines can be used in the polymer, chemical, and food industries for mixing a wide variety of consumer products, including:

  • Adhesives
  • Sealants
  • Mastics
  • Putties
  • Soaps
  • Detergents
  • Toner
  • Plastics
  • Food & feed products
  • Cellulose pulps
  • Chemicals

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Twin Screw Extruders Features

All B&P Littleford twin-screw extruders – the BP, CT, and Specialty - have two intermeshing, co-rotating screws mounted on splined shafts in a closed barrel. The screws are tight and self-wiping, which eliminates stagnant zones over the entire length of the process section. This results in high efficiency and perfect self-cleaning.

Sized to operate for small-scale runs in the lab to large-scale manufacturing.

 B&P Littleford’s line of twin-screw machines also feature:

  • Modular segmented barrel sections
  • Various sized screws for maximum flexibility
  • Specially adapted upstream equipment for feeding
  • Touch display process control system that regulates and monitor the mixing process in real time
  • Productive - 30% greater intake capacity over traditional extruders
  • Consistent performance
  • Easy to maintain and clean
  • Can use patented XLT (extra low temperature) discharge for enhanced pumping efficiency

Providing the Product You Need

B&P Littleford’s series of high-performing, low-maintenance twin-screw extruders deliver the power and precision you require for high-quality compounding and mixing.

BP Twin Screw

BP Twin Screw

B&P Littleford’s sustained focus on offering proven compounding and mixing technology that is reliable, flexible to operate, and easy to maintain resulted in the enhanced BP series extruders.

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CT Twin Screw

CT Twin Screw

B&P Littleford’s CT series extruders are engineering work horses for high torque, high speed compounding applications.

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Specialty Twin Screw

Specialty Twin Screw

B&P Littleford’s Specialty series extruders allow for excellent mixing, optimal degassing, and reliable cooling with high throughput.

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Types of Twin Screw Extruders Offered:

 

BP Series

CT Series

Specialty

OD/ID Ratio

1.76

High Free Volume, Moderate Shear

1.55

Medium Free Volume, High Shear

1.76

High Free Volume, Low Shear

Specific torque (Nm/cm3)

7 – 14

11.5 – 13.7

6 – 13

Barrel Diameter

19, 30, 40, 50, 65, 80, 100, 125, 160

26, 40, 58, 70, 92, 133

30-160

Barrel Design

5D segmented standard, Clam-shell opening optional, XLT design (option)

4D segmented standard

5D segmented standard, Clam-shell opening optional, XLT design (option)

Highlights

Optimum performance and flexibility

Energy efficiency

Ease of feeding

Proven capability

Consistent performance

Modular construction

Customized to handle unconventional processes

Disclaimer: Due to continuous development, actual parameters may differ slightly from those mentioned in the above table.

Twin Screw Extruder Features

Our extruders are configured to help you innovate, maximize and lead. All B&P Littleford twin-screw extruders are equipped with closely intermeshing self-wiping co-rotating screws for mixing. Modular segmented barrel sections and various types of screw elements offer maximum flexibility and cost effectiveness. Specially adapted upstream equipment for feeding and downstream equipment for pelletizing after mixing further expand the extruders into complete systems. We offer extruders in sizes ranging from those suitable for lab scale testing, to pilot and small production runs, to large-scale manufacturing.

Process Control System Features

B&P Littleford’s process control system provides visualization functions to regulate and monitor the mixing process in real time. The system is a clearly arranged touch display and membrane keyboard that allows for:

  • Failsafe interlocking
  • Large view of selectable running mixing data using trends representation
  • Fault message system with visual representation and archiving
  • Convenient operating help in clear text
  • Graphic and tabular representation
  • Multi-step login
  • Language change-over
  • Recipe management of all process parameters

The control system can also be tailored to integrate the upstream and downstream components and provide seamless control of the entire line for enhanced operational efficiency.

Sample Applications

Industry Product
Consumer Products Adhesives, Sealants, Mastics, Putties, Soaps, Detergents, Toner
Plastic Powder Coating, Masterbatch, Color Concentrate, Filled Thermoplastics, BMC, Hot Melt Adhesives, Reinforced Thermoplastics, TPE, Silicone, Silicone Compounds, Fiber Reinforced Compounds

Comprehensive Solutions

B&P Littleford offers a complementary range of ancillary equipment as well as customized control system integration to provide you with a comprehensive and optimized turnkey solution. Our coherent design, planning, and execution of the entire compounding and mixing system pays off for you through system components that are harmonized to each other. Contact us today for details on how we can help with running trials at our Tech Center in Saginaw, MI or helping you design your next process line.

Delivering the Service You Deserve

B&P Littleford designs, develops, and delivers a wide range of mixing, drying, compounding, reacting, extracting and centrifugal separation equipment for many different manufacturing applications.

  • More than 100 years of industry experience
  • Quality parts and service
  • Professional, knowledgeable staff
  • Top-notch testing facilities

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Frequently Asked Questions

What is extrusion?

Extrusion transforms viscous substances into high-quality structured products by accurately controlling processing conditions. Raw materials can be solids (powders, granulates, flours), liquids, slurries, and even gases. Once extruded, these materials become plastics compounds, chemically modified polymers, textured food and feed products, cellulose pulps, and other products. B&P Littleford’s twin screw extruders can transport, compress, mix, cook, shear, heat, cool, pump, and shape with a high degree of flexibility.

What is a twin screw extruder?

A twin screw extruder is a machine consisting of two intermeshing, co-rotating screws mounted on splined shafts in a closed barrel. The screws are tight and self-wiping, which eliminates stagnant zones over the entire length of the process section. This results in high efficiency and perfect self-cleaning. Twin screw extruders can be used in polymer, chemical, and food industries for mixing a variety of consumer products like: 

  • Adhesives
  • Sealants
  • Mastics
  • Soaps/Detergents
  • Plastics
  • Chemicals

What is the difference between single screw and twin screw extruders?

A single screw extruder are single screw machines, while twin screw extruders, as the name implies, have two screws. In single screw extruders, the granular materials stay longer in the extruder and slow production time. Twin screw extruders offer the following advantages:

  • Lower energy use
  • Excellent compounding ability
  • Easy material feeding
  • Excellent exhaust ability

What is a twin screw extruder's purpose?

Extrudes are used to extrude viscous substances into high-quality structured products by accurately controlling processing conditions. Once extruded, these materials become plastics compounds, chemically modified polymers, textured food and feed products, cellulose pulps, and other products.

 

BP Twin Screw

BP Twin Screw

B&P Littleford’s sustained focus on offering proven compounding and mixing technology that is reliable, flexible to operate, and easy to maintain resulted in the enhanced BP series extruders.

Learn More
CT Twin Screw

CT Twin Screw

B&P Littleford’s CT series extruders are engineering work horses for high torque, high speed compounding applications.

Learn More
Specialty Twin Screw

Specialty Twin Screw

B&P Littleford’s Specialty series extruders allow for excellent mixing, optimal degassing, and reliable cooling with high throughput.

Learn More